# Divisors of the Positive Integer 991

1, 991## Sum of all the Divisors of 991, including itself

992## Sum of the Proper Divisors of 991

1## Properties of the number 991

The integer 991 is an**odd**number.

The integer 991 is a

**Prime**number.

1 is

*less than*991, so 991 is a

**deficient**number.

## The number 991 as a Roman Numeral

**CMXCI**

## The number 991 in various Numeral Systems

Base |
Representation |
---|---|

2: | 1111011111 |

3: | 1100201 |

4: | 33133 |

5: | 12431 |

6: | 4331 |

7: | 2614 |

8: | 1737 |

9: | 1321 |

10: | 991 |

11: | 821 |

12: | 6A7 |

13: | 5B3 |

14: | 50B |

15: | 461 |

16: | 3DF |

17: | 375 |

18: | 311 |

19: | 2E3 |

20: | 29B |

21: | 254 |

22: | 211 |

23: | 1K2 |

24: | 1H7 |

25: | 1EG |

26: | 1C3 |

27: | 19J |

28: | 17B |

29: | 155 |

30: | 131 |

31: | 10U |

32: | UV |

33: | U1 |

34: | T5 |

35: | SB |

36: | RJ |